I chose a rhythm pattern coming from Alma Brasileira (Choros 5) for theme A, and a somehow, pianistic movement resemblic resources found in the Momoprecoce.
Self-critic:
I didn't managed to settle theme A due to harmonic and polyphonic development at the right hand; I needed a useless repetition.
LAME: harmony needs to move much further. Final result is a 4-link structure, plus 2 elusive chords.
There is no piano piece by Villa-lobos featuring a so clear ABA form. I think I should try with an ABCA form.
Instant piano improvisation: self-imposed rules are -> I must think, prepare, execute and quick-record a 2 to 10 minute improvisation using an aesthetic, rhythmic or harmonic pattern to match an early XXth century composer's style. Total process should not last more than 30 minutes.
Notes
Completely researched, scored and recorded using 100% Free Libre Open Source Software.
Linux Kernel prepared by Jacobo Nájera
Rosegarden, LADSPA Gverb and Free Akai Steinway tweaked soundfont.